We hadn't met for 20 years, but I recognized her_____ I saw her.
Professor Li preferred _______ lectures to his students to _______ to meetings on scientific developments.
Kathy told me that all the doors and windows _______ when she arrived this morning.
He devoted himself __________ to his research and got many achievements.
A great number of visitors ________ attracted to my hometown, and the number of foreigners there _______ quite large.
I ______ my winter holiday with my family in Beijing next month.